wide bandgap III-V semiconductor featuring direct bandgap 3.5 eV wide; among very few semiconductors capable of generating blue radiation; number one candidate for blue LEDs and lasers;
see "GaN note" on www.semiconductornotes.com for more information.

semiconductor device emitting light; two-terminal rectifying device made using direct bandgap semiconductor; energy generated during recombination processes in the space charge region of the junction (typically p-n) is released in the form of light; wavelength of emitted radiation depends on the width of the bandgap.

LASER, laser

Light Amplification by Stimulated Emission of Radiation; laser is the most common source of coherent, monochromatic radiation.